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S=240m
t=?
V=S/t
t=S/V
t=240m / 30m/s=8s
v = 108 km / h
(po pierwsze zamienić na takie same jednostki ale mi to nie za dobrze idzie. jednak mam nadzieję)
108 * ((1000 / 1) / (3600 / 1)) = 108 * 10 / 36 = 30 m / s
t = s / v
t = 240 m / 30 m / s = 8 s
v*t=s/v
t=s/v
s=108km/h=30m/s
t=240m/30m/s=8s
Odp. Czas wynosi 8s.